ADRIAN T SUMNER / SCIENCE PHOTO LIBRARY ADRIAN T SUMNER / SCIENCE PHOTO LIBRARY
Olduvai Gorge, Great Rift Valley, Serengeti Plains, Tanzania, Africa. This gorge is also known as Oldupai Gorge and The Cradle of Mankind. It is about 30 miles long. Millions of years ago the gorge was a large lake with shores covered with deposits of volcanic ash. Around 500,000 years ago seismic activity diverted a nearby stream, which cut into the sedimentary rock, revealing the main layers in the walls of the gorge.
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